Triassic
Triassic /tɹaɪˈæs.ɪk/ nghĩa là kỉ Tri-át, kỉ Tam Điệp
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kỉ Tri-át · kỉ Tam Điệp
A geologic period within the Mesozoic era, comprising lower, middle and upper epochs from about 250 to 200 million years ago.
The Permian–Triassic extinction event occurred about 250M years ago.
Dinosaurs first appeared earlier in the Triassic Period, roughly 230 million years ago.